I think the dust issue at least has an solid explanation, insofar as most of our electronics have cooling which attracts a lot of dust, much of which falls near

I think the dust issue at least has an solid explanation, insofar as most of our electronics have cooling which attracts a lot of dust, much of which falls nearby. The toys... clearly a desperate attempt by either time travelers or extradimensional entities warning us about an invasion of sentient avocados.